Behavior of cold work hardening and annealing softening and microstructure characteristics of GH3625 superalloy

被引：0
|
作者：
Gao Y.-B. [1 ]
Ding Y.-T. [1 ]
Chen J.-J. [1 ]
Meng B. [1 ]
Ma Y.-J. [1 ]
Xu J.-Y. [1 ]
机构：
[1] State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou
来源：
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | 2019年 / 29卷 / 01期
基金：
中国国家自然科学基金;
关键词：
Annealing softening; Annealing twin; Deformation twin; GH3625; superalloy; Work hardening;
D O I：
10.19476/j.ysxb.1004.0609.2019.01.06
中图分类号：
学科分类号：
摘要：
The evolution of dislocation density, hardness and microstructure of GH3625 superalloy tube during cold plastic deformation and annealing heat treatment were investigated by SEM, OM, XRD and compression test. And the morphology and formation mechanism of twin in the alloy were discussed. The results show that the cold deformation is the main factor which affects the plastic deformation mechanism of GH3625 superalloy. When true strain is less than 0.05, the plastic deformation is dominated by slip deformation, and the mechanism of work hardening is dislocation strengthening. With the increase of the cold deformation, dislocation density and hardness of GH3625 superalloy tube significant increase as well as a large amount of deformation twins appear in the microstructure, and the deformation mode changes from slip-dominated deformation to twin-dominated deformation, and the mechanism is twin strengthening. With the increase of annealing temperature, dislocation density and hardness of GH3625 superalloy tube gradually decrease, and the morphology of annealing twin changes gradually from suspended to transgranular. GH3625 superalloy tube in cold deformarion and annealing processs appears different morphologies of twin, it can be divided into suspended twin and transgranular twin which have different formation mechanisms in growth, the former is the motion of partial dislocations, the latter is the stacking faults mechanism. © 2019, Science Press. All right reserved.
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页码：44 / 53
页数：9
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